Terrorists plotting to carry out a Mumbai-style massacre in western Europe have a list of high-profile targets in their sights ranging from the Eiffel Tower to a hotel near Berlin's famed Brandenburg Gate, according to intelligence relayed to Fox News.

Information about the threat is seeping out as the United States issues a rare blanket travel alert for Americans in Europe, warning about the possibility of an Al Qaeda strike and advising U.S. citizens to be vigilant. The State Department alert did not offer specifics about the targets and countries that could be most at risk, saying only that Americans should be careful around transportation hubs and other popular tourist locations.